Air-feed lock for rock drills



` F. M. SLATER AIR FEED .LOCK FOR ROOK DRxLLs INVENTOR y llafev Filed May 5', 1922 l rus ATTO EY Patented Dec. 2, 1924. y y

UNITED STATES*PATENT/formen ranma. stammt, or EASTON, PENNSYLVANIMASSIGNOB 'ro :Hansson-mn oon- `TbI azz @kam a lmay mem PANY, OF J CITY, JERSEY, A CORPORATION OF NEW 'J'IERSEY.y

' Loox Foa nook names.

' yAppiano@ med nay 5,. 1e22 seriali'- No. 558,778.

Be it known thatv I, AFRED citizen of the United States,*and a resident of ,.Easton, f county4 of Northampton, and

State of Pennsylvania, have ,inventedv a certain. Air-Feed Lock, for `Rock Drillsfofl which the following is aspecificationac companied by drawings.

This invention relates-to fiuid actuated f rock drills but vmore particularly toa Ade-rr4 vice for controlling the feeding element of,` the invention may be f appliedto any drill having afluid actuated,

a stope drill, although feeding element. c r

The objects ofthe invention areto'enable the members of theiuid actuated :feeding element of a stope drill for instance, to be positively locked lagainst relative movement when desired, and effect the control of the.A

lockingdevices preferably by fluid actuated combinations of elements and arrangement `of parts substantially as described and portion ofthe feedin 3+3 of Figure 2,1 loo claimed in thisspecicatiomand shownin =1 one of its preferred. formsin theaccom panying drawings, in which- 4 Figure l will serve to'illustrate the invention,

Figure 2 is an enlargedfdetail. vertical l sectional elevationoof the' feeding element,

Figure?) `1s an enlarged detailsectional elevation partly broken away `of the lower element'con they line ing inthe direction of the arrows, and.

Figure 4 is a sectionalview of Figure 2 onthe the arrows. f f

Referring to the I, drawings, the cylinder l A. kis provided withlthe reciprocating piston -B andthe drill steel C extends` within the front vhead D inzp'osition to receivefthe pact blows of thejpiston delivered .upon the anvil block E, nce the distribution of motivefluid to'ftle cylinder forms no part of the 'present 'inv'ent1on, the ports and Vpas- .'sages are not'thidicated.'

M. SLTKER, a

is a side elevation in longitudinal section of so. much of ak stopedrill asAk `of the scrQWS Uand a toothed member or line 4 -4 looking in the direction of nected to the headblock F.

1A head .block .extension L .is iacutea .be-

tween the head block F and the feed cylin.

der O, adjacent the feed cylinder ange P., The parts so far described are ada ted tobe.,

secured to etherbythe usual *side olts' (not shown). a 1 1 Y, j In the form of fluid actuated feedin'r element illustrated, the feed c linder O, orming oneof thetworelative movable ymembers, 1s connected to the cy inderA"y and its associated parts while the piston Q, and

rod Rforming the other '.ffeeding ele?y ment.` member, are `stationary and provided with the rock engaging kMeans are provided. ing the feeding element members ,against relative movement, and for this purpose, in-

Fointer S.

ter-locking devices "are provided on said `ele` yments, 'which maytake the formi of a, rack T on one o f said members, cooperating with means carried by the other memberfor positively engaging and .inter-locking withthe or positively locksoy rack and thereby positively lockingthe members against relative movement. v

In `thefpresent 1n tance, and" as a convenient construction, the rack T is suitably secured ywithin the pistonrod R as by means members may be carried'in agearsupport or housing V connected bythe gear housing 'i support W to the head blockextension L so that the toothed member orv members of the gear support or housing move vwith the'feed cylinder O. e Y

A suitable and vconvenient form of locking device is that shown in the drawings, and

consists of a' gearX rotatable on the spindle Y carried inthe housing Vand meshing withzthe `rack T.' @Another gear ais rotata-l bleon the spindle I) carried ina yoke a slidf able in the housing V and normally ,separated from the gear X'bythe' coil springs das indicated in Fi ure 1 and as shown in deut said gear .a is in con-` stant engagement withthe rackT, land withy tail in Figure 3,

the parts in such position, the membersof the feeding elementare free to .move relatively for feeding the machine.

In order to lockthe feeding mechanism" rovided for from` movement, means are t e gear X as causing the gear a to engage indicated in Figures 2 and 3, and forthis purpose, fluid actuated means under the controlof the operator are preferably provided. A rodve extends through the gear housing support Wand bears at its lower end upon the yoke c. A sprmg f4 normally retracts the rod e and at'its upper end, the

`entialfvalvelc having the. heads of and. is -movable in said handle. A port lea s "from the handle to the piston g, and t e hollow bore of the handle K'is o en to atmosphere at one end r so that w enthehand controlled valve h is ini o enposition, as indicated in Figure 1, the bore of the handle is also vented to atmosphere atjtheopposite end through the ports located in a sleeve a. Under these circumstances, pressure 'supplied 'tothe valve between the'he'ads o lso head o.

and p will force the lvalve tothe right,v as indicated in Figure 1, since the pressure area of the head is greater than the area of the en the port s inthe handle is closed by the valve h, the leakage oflluid "pressure from the suppl7 around the head p of the' valve la, will buil up'pressure onl the face t of the said head p and as the o posite end of the valve is open to atmosp ere the valve will be moved to the lefta suliicient distance toconnect the passage y' with the port and supply pressure above the piston g w ich forces thel piston downwardly. andpresses the yoke c downwardly to carry the `gear intov the engagement with the gear X.' The gearswill then'be inter-locked: t and as they both englage` the rack T relative e members of the feeding element is prevented, and said members are positively locked.

1.v Ina fluid'actuated rock drill, the; combination of a cylinder, a fluid actuated feeding element having relatively movable members, one being connected to said cylinder, andthe other being stationary, and inter-enmovement between t gagmg means for preventing movement of .v ber, and means for positively locking saidy the feeding element members', comprising three members,ftwo of said/members being in constant engagement with the third memthree members together.` H

2. In a fluid actuated rock drill, the com- 'bination ofa cylinder a fluid actuated feeding element havingre atively movable mem- "ment,r

bers, `one being connected tosaid c linder, and the other being stationary, and uid actuatedA means for positively locking said feeding element members .a ainst relative movement, said means inclu 'ng a pair of relatively movable toothed members.

3. In a luid actuated rock drill, the combination of a cylinder, a fluid actuated feeding element having relatively movable members, one being connected to said c linder, and the otherbeing stationary, and uid actuated *interlockin devices for positively locking saidl fee ing element members against relative movement, said devices includin a; rack and gear, saidggear being ada te to be moved on the rack independent yV of l the' movement of the feeding element.

g *4. In ailuid actuated rock drill, thecombers, one` being connected to said cylinder,

andthe other being stationary, a rack on one of said members, and fluid actuated means carried by the other 4member and movable along the rack for positively engaging and interlockiu with the rack for positively locking sai members against relatlve move- `5. yIna. fluid actuated rock drill, the combination of a cylinder, a Huid actuated feeding elementhaving relatively movable members, one being connected to saidcylinder, and vthe other being stationary, 1a rack on one of said members, a gear-carried bythe other member'engagin said rack, and fluid actuated means-adapted to engage said rack and gear for lockingsaid gear against rotation. v

6. In a fluid actuated rock drill, the combination of a cylinder,-a-fluid actuated feeding elementhaviug relatively movable members, one being connected to said cylinder, and-the otherbeing stationary, a rack on one ofsaid members,- gears carriedy by the other memberengaging 'said rack', and iuid iactuated means for interlocking said gears.

.7. In a fluid actuated rock drill, the combination of a cylinder, a fluid actuated feeding'element having relatively,movable members, one being' connected-to said cylinder and the other .being stationary, and interengaging'means for locking the feeding element members 'against movement, comprising three toothed members, two of said memvbers being vvcarried by one vof the feeding element members, and iuid actuatedmeans for locking the threemembers together.

In testimony whereof I have signed this specification.

- "FRED 'Mg SLATER. 

